I am an Albion fan so my view is thus: I think there is a decent enough player inside somewhere but he has not got the application or required work-rate to succeed in a top league. My hunch was he did really well in The Netherlands but did not realise how much of a step-up in standard the Premier League would be...It came as no surprise that he scored most of his goals against lower-league opposition in cup games. He does also seem to be more interested in recording music than playing football.
I doubt we will see him back at the Albion again or even in the Premier League in general. He might do OK at an average team in one of the other PB leagues, but I personally would not invest.